<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        .item1 {
            font-size: 16px;
        }

        .item2 {
            font-size: 12pt;
        }
    </style>
</head>
<body>
<div class="item1">hello world</div>
<div class="item2">hello world</div>
<p style="font-size: 12pt; line-height: 18pt;">This is some text.</p>
<p style="font-size: 16px; line-height: 24px;">This is some text.</p>

</body>
</html>